Improvement in turning-lathes



11.81.1112. TURNING LATHE.

No. 46,152. Patenne'd Jan. 31, 1865.

UNITED STATES .PATENT OFFICE.

DWIGHTYSLATE, OF HARTFORD, CONNECTICUT.

IMPROVEMENT lN TU RNlNG-LATH ES.

Specification forming part of Letters Patent No. 46,152, dated January3l, 1365.

To all whom it may concern.-

Beit known that I, DWIGHT SLATE, of Hartford, in the county of Hartfordand State of' Connecticut, have invented certain new and usefulImprovements in Turning-Lathes 5 and I do hereby declare that thefollowin g is a full, clear, and exact description of the same,reference being had to the accompanyingdrawings,` and to the letters ofreference marked thereon.

My invention relates to that kind of turningla-the in which thearrangement for turning tapering and curved forms consists in giving tothe cutting-tool a motion in and out to and from the axis ofthelathe-spindle, in combination with the longitudinal motion ot' thefeedcarriagc.

Iam aware that several devices have been invented and patented forproducing 4the above-described movements of the tool, among which I maymention those ot' J ames S. Brown and E. K. Root; but these have inpractice proved somewhat objectionable, either by being inconvenient'inworking and adjusting, inaccurate-in action, or of expensiveadaptation.

It is the object of my invention to produce "an arrangement of parts forgiving to the tool inventions, intcrvenes between the upper or toolcarriage and the lower ori'eed carriage, whereby 1 insure greatersolidity and more precise action of the tool. i

v.To these ends my said invention consists in the employment, inconnection with the feed and tool carriages, and with a guide-barlocated at the back ot the lathe, ot' a connectin g-bar, formed andarranged substantially as hereinafter described, which connects thetoolcarriage with the guide-bar through the adjustin g-screw of the saidcarriage in a manner which will be clearly explained and my saidinvention also consists in attaching the connecting-bar which controlsthe tool-carriage to the guide-bar by means of a slide jointed to theconnecting-bar, and so formed, substantially as described, as to lockonto the guidebar, and thus give to the tool-carriage positive imovements both in and out.

To enable others skilled in the arts to make and use my invention, Iwill proceedto a description thereof, referring to the accompanyingdrawings, making part of this specification, in which- Figure l is aplan of paris of a lathe with my invention applied thereto. Fig. 2 is anend view ot` the same with the tail-block removed. Fig. 3 is a verticalsection at line A A, Fig. l, drawn on a large scale. Fig. -i is avertical section at line B B, Fig. 3. Fig. 5 shows the connecting-barfin detail. Fig. 6

is a cross-section of the guide bar g, and Fi g,

7 shows the slide l. in detail. y

Similar marks of reference denote the same parts in the several igures.

a is the bed of thelathe; l), the lower or feed carriage, which slidesin the usual way on guides made on the top of the bed parallelv with theaxis XX of the lathe-spindle, and c is the upper or tool carriage, whichslides on guides formed on the feed-carriage at a right angle. with theaxis X X.- These parts may have the general form and arrangement ofcorresponding parts in the lathes in most general use, and the lower orfeed carriage may receive itslongitudinal movement by-any of the usualfeed apparatus. The upper or tool carriage, c, is adjusted to the workby the usual screw, d, which is confined to .said carriage by'collars ee, Fig. 3. The nut for the adjusting-screw d, instead of being securedto the feed-carriage b, as is the case in lathes of ordinary'construction, forms part of a bar, f, which lies loosely in a groove inthe top of the lower carriage, b. This bar j' projects beyond thecarriage at the rear of the lathe, and its end is there jointed at h toa slide, which is locked onto a long ouide-bar r which extends nearlfrom end o LJ# to end of the lathe, and is so attached to the bed byajoint-pin, i, and bolt k that it maybe inclined to the axis X X of thespindle. The guide-bar g is grooved near its edge through nearly itsentire length, (see cross section, Fig. 6,) and the slide Z is lockedonto the bar g by means of lips on m, Fig. 7, which enter the grooves inthe guide-bar, and a gib or shoe, o, which is causedl to press againstthe edge ot' the guide-bar by setscrews p p.

s is a set-screw, by means of which the connectingbar f may be clampedto the lower earriage and secured thereto in case it may be desirable todetach the bar f from the slide l,

-when the-lathe may be used in the customary 4above description.

To make use of the apparatus it is necessary, first, to set theguide-bar g at the proper angle, then to adjust the tool to the work inthe usual way by the screw d, and proceed as with the ordinary lathe. Toadapt my inven tion to almost any of the usual forms of lathes it willonly be necessary to furnish supports for the guide-bar to place agroove in the top of the lower carriage forthe reception of theconnecting-bar f, and to t the nut in the connectinglbar to theadjusting-screw d ot' the tool-carriage. To turnforms havin g a curvedprofile, the guidebar may be formed to the are of a circle and the formof the slide l be adapted thereto; but if it be desired to turn formshaving irregular profile, which will require the employment of aguide-bar having its edge of corresponding form or profile, the slide Zmust be dispensed with and the end of the connecting-bar be armed with aproperlyshaped shoe, which may be caused to press against and` followthe irregularities of the edge of the guide-bar by means of a strong`spring or by a weight acting on the tool carriage in a similar Way tothe Weight which is used for a somewhat analogous purpose, described inthe patent of J. S. Brown, before aliuded to.

It is obvious that a modification of my invention may be made byattaching the adjusting-screw of the toolearriage to the conneeting-barf and the nut to the carriage Without departing` from the spirit of theinvention.

Having thus described my invention and set forth its use, I disclaim thenovelty of the guide-bar g but Vhat I claim as my invention, and desireto secure by Letters Patent, is-

1. The employment, in combination with the guide-bar g and with theadjustingserew (1,01' its equivalent, of the tool-carriage, oftheconnecting-barf, arranged substantially as hereinbefore set forth.`

2. The employment, in combination with the guide-bar and eonneetin g-baraforesaid, of the slide l, jointed to the connecting-bar and locked tothe guide-bar, substantially as and for the purpose hereinbeforespecified.

In testimony whereof l have hereunto set my hand this 10th day ofSeptember, 1864.

DWIGHT SLATE.

Witnesses:

LEWIS SHELDON, C. B. RICHARDS.

HAL

